docs: add new button color props

Author: dgarcia360

docs/customization/feedback-events.mdx

@@ -4,6 +4,10 @@ sidebar_position: 5
 
 # Events
 
+:::info
+This feature is only available on the [Professional](https://pushfeedback.com#pricing) and [Unlimited](https://pushfeedback.com#pricing) plans.
+:::
+
 This guide explains how to listen for events emitted by the feedback widget and handle them with JavaScript.
 
 ## Events overview

docs/customization/styles.mdx

@@ -50,8 +50,10 @@ The tables below lists all the available properties you can override:
     --feedback-button-border-radius: 20px;
     --feedback-button-dark-bg-color: var(--feedback-primary-color);
     --feedback-button-dark-text-color: var(--feedback-white-color);
+    --feedback-button-dark-icon-color: var(--feedback-white-color);
     --feedback-button-light-bg-color: var(--feedback-white-color);
     --feedback-button-light-text-color: var(--feedback-primary-color);
+    --feedback-button-light-icon-color: var(--feedback-primary-color);
     --feedback-button-text-font-size: var(--feedback-text-font-size);
     --feedback-button-text-font-weight: 600;
     --feedback-button-z-index: 300;